Improvement in mortising-m ach i nes



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W- w /J w, M, d. m wm mmf M AM. PHUTD-LITH'U. C0Y NN'. (DSBORN E'S PROCESS) UNITED STATES PATENT Ormes;

JEROME B. STARK, OF FISHERVILLE, NEW HAMPSHIRE.

Specification forming part of Letters Patent No. 56,@20, dated July 31, 1866.

To all whom it may concern.-

Beit known that LJEROME B. STARK, of Fisherville, in the county of Merrimac and State of New Hampshire, have invented a new and useful or Improved Machine for Mortising Timber; and I do hereby declare the same to be fully described in the following specification and represented in the accompanying 1 timber having the machine applied to it. 'B

is what I term the supporter, which consists of a base-plate, a, provided with a means of clamping it to a timber, such means consisting not only of an arm, b, projecting down from the base-plate, but a cammed lever, o, applied to a journal, d, extending from such arm. The cammed lever is to be formed as represented, andis to turn freely on the journal d, which may be adjustable vertically on the arm and be provided with a clamp-screw and nut,

by which its distance from the base-plate may be determined. The cammed lever is to operate against the under side of the timber so as to clamp the supporter to such timber.

The said supporter has two toothed racks, of, arranged on and xed to its upper surface, they being placed side by side. A frame, o, is applied to the supporter so as to be capable of slidinglengthwise thereon. It rests on the supporter, and is maintained thereon by means of four projections, g g g g, each of which extends down from it and a short distance underneath the base-plate.

The said frame supports the shaft h of the mortising-chisel e', and in such manner as to enable it to be moved up or down in a vertical line. This shaft, at its upper end, is connected with and so as to be capable of revolv- Aing within a block, 7c, which is hinged to a 1ever, l. A spring-catch, m, fixed to the shaft, serves (by taking into either of the notches a n made in the block) to hold the shaft so as to prevent it from revolving in the block.

The shorter arm of the lever l is connected with the upper part of the frame G by means of a linlrconnection, D. Within the frame C are two bent levers, E F, which are formed and arranged in the frame in such manner that one of them shall be directly over one of the toothed racks and the other immediately over the other of such racks. The longer arms of these levers pass through slots o o in a lifter, G, which depends from the shorter arm of the lever l, and is formed as represented.

A pawl, p, is hinged to the shorter arm of each of the bent levers E F, and arranged as shown in Fig. l. One of these pawls is intended to operate in one and the other in the other of the two racks.

Each of such pawls has one of two cords, 1' r, extending from it upward to and through the cross-head s of the frame G. These cords are subsequently fastened to a pin, t, projecting from the shaft h, and so that one of the pawls, when the lever is turned to or nearly to its highest position, may be drawn above and out of its rack, and the other be suffered to remain in its rack, and by its action therein cause the frame C to be moved along on the base-plate a short distance. By moving the springcatch m out of its notch n in the block k and revolving the chisel-shaft one hundred and eighty degrees, we shall wind one of the cords on the shaft and correspondingly unwind the other therefrom, the same being so as while the lever may be in the act of being raised the wound cord shall be caused to elevate its pawl out of action with its rack and the unwound cord be causedlto4 let its pawl fall into its rack.

By imparting tothe lever l a reciprocating motion sufficient to depress the chisel into the timber, and subsequently lift it out thereof, we may, prior to each downward stroke of the chisel, produce a movement of the frame C and the chisel such as may be necessary to bring the chisel into a new position for cutting into the timber. After the' chisel may have made a sucient number of cuts in the timber the chisel-shaft should be turned around one hundred and eighty degrees, after which, if we continue the movements of the lever, the

chisel will not only continue its cuts, but be moved over the timber in a direction the reverse of that in which it was previously moved.

I would remark that one rack made With upright teeth may be substituted for the two racks with triangular teeth; but I prefer the vtwo made as represented.

I claim- The feeding mechanism or combination as described, the same consisting of the two racks ef, the paWlsl p p, the pawl-levers E F, the

lifter G, and the cords r r, the Whole being arranged and applied, as explained, to the supporter B, the frame C, the chisel-shaft and its operative lever, connected with the said shaft by means of the recessed block lo, and the springatch, as specified.

JEROME B. STARK.

Witnesses:

R. H. EDDY, F. P. HALE, J r. 

